It is no surprise that the world below the surface of Paris, in fact its "negative", has created over the centuries a great number of urban legends. Since the Middle Age, from 220 miles of obscure quarries have been extracted hundred tons of stone to build the City of Light. In these galleries left empty, have been dumped 6 millions of human remains. They have scared everyone away except smugglers, thieves, freedom fighters and revolutionaries, who always found in Paris's belly a perfect place to hide. PARIS UNDERGROUND is the most extensive and fascinating journey in this underworld. But there is much more: catacombs, quarries, metro subway system, sewers, WW2 bunker, canals, prison, secret laboratories and many bizarre places to be discovered. Welcome to this unexplored territory.